if you search google with the argument (without quotes) "variable speed energy
savings", you will locate several document which address the issue
empirically, you can calculate an approximate estimate, considering an average
motor consuming 42w versus 1000w (or more) for a non-vs motor, using an average
of electricity at 0.13 cents/kWh (use appropriate rate for your region)
in a modern hp installation, other factors come to play when calculating length
payback, not only the single component of variable speed blower
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